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Annotation of XNU/bsd/miscfs/procfs/procfs_vfsops.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*     $NetBSD: procfs_vfsops.c,v 1.23 1995/03/09 12:05:54 mycroft Exp $       */
        !            23: 
        !            24: /*
        !            25:  * Copyright (c) 1993 Jan-Simon Pendry
        !            26:  * Copyright (c) 1993
        !            27:  *     The Regents of the University of California.  All rights reserved.
        !            28:  *
        !            29:  * This code is derived from software contributed to Berkeley by
        !            30:  * Jan-Simon Pendry.
        !            31:  *
        !            32:  * Redistribution and use in source and binary forms, with or without
        !            33:  * modification, are permitted provided that the following conditions
        !            34:  * are met:
        !            35:  * 1. Redistributions of source code must retain the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer.
        !            37:  * 2. Redistributions in binary form must reproduce the above copyright
        !            38:  *    notice, this list of conditions and the following disclaimer in the
        !            39:  *    documentation and/or other materials provided with the distribution.
        !            40:  * 3. All advertising materials mentioning features or use of this software
        !            41:  *    must display the following acknowledgement:
        !            42:  *     This product includes software developed by the University of
        !            43:  *     California, Berkeley and its contributors.
        !            44:  * 4. Neither the name of the University nor the names of its contributors
        !            45:  *    may be used to endorse or promote products derived from this software
        !            46:  *    without specific prior written permission.
        !            47:  *
        !            48:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            49:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            50:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            51:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            52:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            53:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            54:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            55:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            56:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            57:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            58:  * SUCH DAMAGE.
        !            59:  *
        !            60:  *     @(#)procfs_vfsops.c     8.5 (Berkeley) 6/15/94
        !            61:  */
        !            62: 
        !            63: /*
        !            64:  * procfs VFS interface
        !            65:  */
        !            66: 
        !            67: #include <sys/param.h>
        !            68: #include <sys/time.h>
        !            69: #include <sys/kernel.h>
        !            70: #include <sys/proc.h>
        !            71: #include <sys/buf.h>
        !            72: #include <sys/syslog.h>
        !            73: #include <sys/mount.h>
        !            74: #include <sys/signalvar.h>
        !            75: #include <sys/vnode.h>
        !            76: #include <miscfs/procfs/procfs.h>
        !            77: #include <vm/vm.h>                     /* for PAGE_SIZE */
        !            78: 
        !            79: /*
        !            80:  * VFS Operations.
        !            81:  *
        !            82:  * mount system call
        !            83:  */
        !            84: /* ARGSUSED */
        !            85: procfs_mount(mp, path, data, ndp, p)
        !            86:        struct mount *mp;
        !            87:        char *path;
        !            88:        caddr_t data;
        !            89:        struct nameidata *ndp;
        !            90:        struct proc *p;
        !            91: {
        !            92:        size_t size;
        !            93: 
        !            94:        if (UIO_MX & (UIO_MX-1)) {
        !            95:                log(LOG_ERR, "procfs: invalid directory entry size");
        !            96:                return (EINVAL);
        !            97:        }
        !            98: 
        !            99:        if (mp->mnt_flag & MNT_UPDATE)
        !           100:                return (EOPNOTSUPP);
        !           101: 
        !           102:        mp->mnt_flag |= MNT_LOCAL;
        !           103:        mp->mnt_data = 0;
        !           104:        getnewfsid(mp, makefstype(MOUNT_PROCFS));
        !           105: 
        !           106:        (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN, &size);
        !           107:        bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
        !           108:        bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
        !           109:        bcopy("procfs", mp->mnt_stat.f_mntfromname, sizeof("procfs"));
        !           110:        return (0);
        !           111: }
        !           112: 
        !           113: /*
        !           114:  * unmount system call
        !           115:  */
        !           116: procfs_unmount(mp, mntflags, p)
        !           117:        struct mount *mp;
        !           118:        int mntflags;
        !           119:        struct proc *p;
        !           120: {
        !           121:        int error;
        !           122:        extern int doforce;
        !           123:        int flags = 0;
        !           124: 
        !           125:        if (mntflags & MNT_FORCE) {
        !           126:                /* procfs can never be rootfs so don't check for it */
        !           127:                if (!doforce)
        !           128:                        return (EINVAL);
        !           129:                flags |= FORCECLOSE;
        !           130:        }
        !           131: 
        !           132:        if (error = vflush(mp, 0, flags))
        !           133:                return (error);
        !           134: 
        !           135:        return (0);
        !           136: }
        !           137: 
        !           138: procfs_root(mp, vpp)
        !           139:        struct mount *mp;
        !           140:        struct vnode **vpp;
        !           141: {
        !           142: 
        !           143:        return (procfs_allocvp(mp, vpp, 0, Proot));
        !           144: }
        !           145: 
        !           146: /* ARGSUSED */
        !           147: procfs_start(mp, flags, p)
        !           148:        struct mount *mp;
        !           149:        int flags;
        !           150:        struct proc *p;
        !           151: {
        !           152: 
        !           153:        return (0);
        !           154: }
        !           155: 
        !           156: /*
        !           157:  * Get file system statistics.
        !           158:  */
        !           159: procfs_statfs(mp, sbp, p)
        !           160:        struct mount *mp;
        !           161:        struct statfs *sbp;
        !           162:        struct proc *p;
        !           163: {
        !           164: 
        !           165: #ifdef COMPAT_09
        !           166:        sbp->f_type = 10;
        !           167: #else
        !           168:        sbp->f_type = 0;
        !           169: #endif
        !           170:        sbp->f_bsize = PAGE_SIZE;
        !           171:        sbp->f_iosize = PAGE_SIZE;
        !           172:        sbp->f_blocks = 1;      /* avoid divide by zero in some df's */
        !           173:        sbp->f_bfree = 0;
        !           174:        sbp->f_bavail = 0;
        !           175:        sbp->f_files = maxproc;                 /* approx */
        !           176:        sbp->f_ffree = maxproc - nprocs;        /* approx */
        !           177:        if (sbp != &mp->mnt_stat) {
        !           178:                bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
        !           179:                bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
        !           180:                bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
        !           181:        }
        !           182:        strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
        !           183:        sbp->f_fstypename[MFSNAMELEN] = '\0';
        !           184:        return (0);
        !           185: }
        !           186: 
        !           187: procfs_quotactl(mp, cmds, uid, arg, p)
        !           188:        struct mount *mp;
        !           189:        int cmds;
        !           190:        uid_t uid;
        !           191:        caddr_t arg;
        !           192:        struct proc *p;
        !           193: {
        !           194: 
        !           195:        return (EOPNOTSUPP);
        !           196: }
        !           197: 
        !           198: procfs_sync(mp, waitfor)
        !           199:        struct mount *mp;
        !           200:        int waitfor;
        !           201: {
        !           202: 
        !           203:        return (0);
        !           204: }
        !           205: 
        !           206: procfs_vget(mp, ino, vpp)
        !           207:        struct mount *mp;
        !           208:        ino_t ino;
        !           209:        struct vnode **vpp;
        !           210: {
        !           211: 
        !           212:        return (EOPNOTSUPP);
        !           213: }
        !           214: 
        !           215: procfs_fhtovp(mp, fhp, vpp)
        !           216:        struct mount *mp;
        !           217:        struct fid *fhp;
        !           218:        struct vnode **vpp;
        !           219: {
        !           220: 
        !           221:        return (EINVAL);
        !           222: }
        !           223: 
        !           224: procfs_vptofh(vp, fhp)
        !           225:        struct vnode *vp;
        !           226:        struct fid *fhp;
        !           227: {
        !           228: 
        !           229:        return (EINVAL);
        !           230: }
        !           231: 
        !           232: procfs_init()
        !           233: {
        !           234: 
        !           235:        return (0);
        !           236: }
        !           237: 
        !           238: struct vfsops procfs_vfsops = {
        !           239:        MOUNT_PROCFS,
        !           240:        procfs_mount,
        !           241:        procfs_start,
        !           242:        procfs_unmount,
        !           243:        procfs_root,
        !           244:        procfs_quotactl,
        !           245:        procfs_statfs,
        !           246:        procfs_sync,
        !           247:        procfs_vget,
        !           248:        procfs_fhtovp,
        !           249:        procfs_vptofh,
        !           250:        procfs_init,
        !           251: };

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